Find an equation of the plane tangent to the surface z = x2 - y2 at the point (2, 1, 3) .
A) 4x - 2y + z = 9
B) 4x - 2y - z = 3
C) 4x + 2y + z = 13
D) 4x + 2y - z = 7
E) 4x - 2y + z = -9
Correct Answer:
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